[klibc] [klibc:master] Add LoongArch64 port
klibc-bot for Feiyang Chen
chenfeiyang at loongson.cn
Sat Mar 4 16:30:06 PST 2023
Commit-ID: 53ce949578446360c4b636a46eadfdb7aed2779d
Gitweb: http://git.kernel.org/?p=libs/klibc/klibc.git;a=commit;h=53ce949578446360c4b636a46eadfdb7aed2779d
Author: Feiyang Chen <chenfeiyang at loongson.cn>
AuthorDate: Mon, 20 Feb 2023 10:46:02 +0800
Committer: Ben Hutchings <ben at decadent.org.uk>
CommitDate: Fri, 3 Mar 2023 21:13:27 +0100
[klibc] Add LoongArch64 port
Add LoongArch64 support. I've cribbed most of this from the
RISC-V and MIPS ports.
Signed-off-by: Feiyang Chen <chenfeiyang at loongson.cn>
Signed-off-by: Ben Hutchings <ben at decadent.org.uk>
---
.../{riscv64 => loongarch64}/klibc/archconfig.h | 2 +-
.../{riscv64 => loongarch64}/klibc/archsetjmp.h | 11 +++--
.../arch/{ppc => loongarch64}/klibc/archsignal.h | 2 +-
.../arch/{riscv64 => loongarch64}/machine/asm.h | 4 +-
usr/klibc/SYSCALLS.def | 2 +-
usr/klibc/arch/loongarch64/Kbuild | 7 +++
usr/klibc/arch/{sparc64 => loongarch64}/MCONFIG | 17 ++++----
usr/klibc/arch/{riscv64 => loongarch64}/crt0.S | 14 +++---
usr/klibc/arch/loongarch64/setjmp.S | 50 ++++++++++++++++++++++
usr/klibc/arch/loongarch64/syscall.S | 13 ++++++
usr/klibc/arch/{riscv64 => loongarch64}/sysstub.ph | 10 ++---
11 files changed, 97 insertions(+), 35 deletions(-)
diff --git a/usr/include/arch/riscv64/klibc/archconfig.h b/usr/include/arch/loongarch64/klibc/archconfig.h
similarity index 84%
copy from usr/include/arch/riscv64/klibc/archconfig.h
copy to usr/include/arch/loongarch64/klibc/archconfig.h
index e85a69c0..7a47b915 100644
--- a/usr/include/arch/riscv64/klibc/archconfig.h
+++ b/usr/include/arch/loongarch64/klibc/archconfig.h
@@ -1,5 +1,5 @@
/*
- * include/arch/riscv64/klibc/archconfig.h
+ * include/arch/loongarch64/klibc/archconfig.h
*
* See include/klibc/sysconfig.h for the options that can be set in
* this file.
diff --git a/usr/include/arch/riscv64/klibc/archsetjmp.h b/usr/include/arch/loongarch64/klibc/archsetjmp.h
similarity index 73%
copy from usr/include/arch/riscv64/klibc/archsetjmp.h
copy to usr/include/arch/loongarch64/klibc/archsetjmp.h
index 97d6b6be..939c0f5f 100644
--- a/usr/include/arch/riscv64/klibc/archsetjmp.h
+++ b/usr/include/arch/loongarch64/klibc/archsetjmp.h
@@ -1,12 +1,15 @@
/*
- * arch/riscv64/include/klibc/archsetjmp.h
+ * include/arch/loongarch64/klibc/archsetjmp.h
*/
#ifndef _KLIBC_ARCHSETJMP_H
#define _KLIBC_ARCHSETJMP_H
struct __jmp_buf {
- unsigned long __pc;
+ unsigned long __ra;
+ unsigned long __sp;
+ unsigned long __r21;
+ unsigned long __fp;
unsigned long __s0;
unsigned long __s1;
unsigned long __s2;
@@ -16,10 +19,6 @@ struct __jmp_buf {
unsigned long __s6;
unsigned long __s7;
unsigned long __s8;
- unsigned long __s9;
- unsigned long __s10;
- unsigned long __s11;
- unsigned long __sp;
};
typedef struct __jmp_buf jmp_buf[1];
diff --git a/usr/include/arch/ppc/klibc/archsignal.h b/usr/include/arch/loongarch64/klibc/archsignal.h
similarity index 80%
copy from usr/include/arch/ppc/klibc/archsignal.h
copy to usr/include/arch/loongarch64/klibc/archsignal.h
index 9c3ac927..c22a5d7c 100644
--- a/usr/include/arch/ppc/klibc/archsignal.h
+++ b/usr/include/arch/loongarch64/klibc/archsignal.h
@@ -1,5 +1,5 @@
/*
- * arch/ppc/include/klibc/archsignal.h
+ * include/arch/loongarch64/klibc/archsignal.h
*
* Architecture-specific signal definitions
*
diff --git a/usr/include/arch/riscv64/machine/asm.h b/usr/include/arch/loongarch64/machine/asm.h
similarity index 86%
copy from usr/include/arch/riscv64/machine/asm.h
copy to usr/include/arch/loongarch64/machine/asm.h
index 9effc935..6fe5dba2 100644
--- a/usr/include/arch/riscv64/machine/asm.h
+++ b/usr/include/arch/loongarch64/machine/asm.h
@@ -1,7 +1,5 @@
/*
- * arch/riscv64/include/machine/asm.h
- *
- * Mostly cribbed from mips.
+ * include/arch/loongarch64/machine/asm.h
*/
#ifndef _MACHINE_ASM_H
diff --git a/usr/klibc/SYSCALLS.def b/usr/klibc/SYSCALLS.def
index 660efc66..9b6b1127 100644
--- a/usr/klibc/SYSCALLS.def
+++ b/usr/klibc/SYSCALLS.def
@@ -21,7 +21,7 @@ void _exit,exit::_exit(int);
<?!ia64> pid_t clone::__clone(unsigned long, void *);
<?ia64> pid_t clone::__clone2(unsigned long, void *, void *);
# if ! _KLIBC_NO_MMU
-<!sparc,sparc64,ia64,arm64,riscv64> pid_t fork();
+<!sparc,sparc64,ia64,arm64,riscv64,loongarch64> pid_t fork();
<sparc,sparc64> pid_t fork at forkish();
#endif
#if _KLIBC_REAL_VFORK
diff --git a/usr/klibc/arch/loongarch64/Kbuild b/usr/klibc/arch/loongarch64/Kbuild
new file mode 100644
index 00000000..60c7660c
--- /dev/null
+++ b/usr/klibc/arch/loongarch64/Kbuild
@@ -0,0 +1,7 @@
+#
+# klibc files for LoongArch64
+#
+
+klib-y := setjmp.o syscall.o
+always := crt0.o
+targets := crt0.o
diff --git a/usr/klibc/arch/sparc64/MCONFIG b/usr/klibc/arch/loongarch64/MCONFIG
similarity index 51%
copy from usr/klibc/arch/sparc64/MCONFIG
copy to usr/klibc/arch/loongarch64/MCONFIG
index d8c878aa..0ef5eae8 100644
--- a/usr/klibc/arch/sparc64/MCONFIG
+++ b/usr/klibc/arch/loongarch64/MCONFIG
@@ -1,24 +1,23 @@
# -*- makefile -*-
#
-# arch/sparc64/MCONFIG
+# arch/loongarch64/MCONFIG
#
# Special rules for this architecture. Note that this is actually
# included from the main Makefile, and that pathnames should be
# accordingly.
#
-KLIBCARCHREQFLAGS = -m64 -D__sparc64__
-KLIBCOPTFLAGS += -Os
+KLIBCOPTFLAGS += -Os -fomit-frame-pointer
KLIBCBITSIZE = 64
-KLIBCLDFLAGS = -m elf64_sparc
-
# Extra linkflags when building the shared version of the library
# This address needs to be reachable using normal inter-module
# calls, and work on the memory models for this architecture
-# Normal binaries start at 1 MB; the linker wants 1 MB alignment,
-# and call instructions have a 30-bit signed offset, << 2.
-KLIBCSHAREDFLAGS = $(LD_IMAGE_BASE_OPT) 0x80000000
+# 4862 MB - normal binaries start at 4608 MB. Non-PIC jumps usually
+# use the BL instruction which requires a destination between -128M
+# to 128M. Since we can't put ourselves below the normal load
+# address, use the very top of the 128M region (minus 2MB)
+KLIBCSHAREDFLAGS = $(LD_IMAGE_BASE_OPT) 0x127E00000
# Kernel has never used stack trampolines
-KLIBCEXECSTACK := n
+KLIBCEXECSTACK := n
diff --git a/usr/klibc/arch/riscv64/crt0.S b/usr/klibc/arch/loongarch64/crt0.S
similarity index 54%
copy from usr/klibc/arch/riscv64/crt0.S
copy to usr/klibc/arch/loongarch64/crt0.S
index 76fa3c28..cb3da669 100644
--- a/usr/klibc/arch/riscv64/crt0.S
+++ b/usr/klibc/arch/loongarch64/crt0.S
@@ -1,5 +1,5 @@
#
-# arch/riscv64/crt0.S
+# arch/loongarch64/crt0.S
#
# Does arch-specific initialization and invokes __libc_init
# with the appropriate arguments.
@@ -11,12 +11,8 @@
#include <machine/asm.h>
ENTRY(_start)
- .option push
- .option norelax
- lla gp, __global_pointer$
- .option pop
-
- mv a0, sp # Pointer to ELF entry structure
- mv a1, zero # No onexit pointer
- jal __libc_init
+ move $a0, $sp # Pointer to ELF entry structure
+ move $a1, $zero # No onexit pointer
+ bstrins.d $sp, $zero, 3, 0 # Align stack to 16 bytes
+ bl __libc_init
END(_start)
diff --git a/usr/klibc/arch/loongarch64/setjmp.S b/usr/klibc/arch/loongarch64/setjmp.S
new file mode 100644
index 00000000..11779885
--- /dev/null
+++ b/usr/klibc/arch/loongarch64/setjmp.S
@@ -0,0 +1,50 @@
+/*
+ * arch/loongarch64/setjmp.S
+ *
+ * setjmp/longjmp for the LoongArch64 architecture
+ *
+ * The jmp_buf is assumed to contain the following, in order:
+ * pc (ra)
+ * sp
+ * r21
+ * fp
+ * s0..s8
+ */
+
+#include <machine/asm.h>
+
+ENTRY(setjmp)
+ st.d $ra, $a0, 0
+ st.d $sp, $a0, 8
+ st.d $r21, $a0, 16
+ st.d $fp, $a0, 24
+ st.d $s0, $a0, 32
+ st.d $s1, $a0, 40
+ st.d $s2, $a0, 48
+ st.d $s3, $a0, 56
+ st.d $s4, $a0, 64
+ st.d $s5, $a0, 72
+ st.d $s6, $a0, 80
+ st.d $s7, $a0, 88
+ st.d $s8, $a0, 96
+ move $a0, $zero
+ jr $ra
+END(setjmp)
+
+ENTRY(longjmp)
+ ld.d $ra, $a0, 0
+ ld.d $sp, $a0, 8
+ ld.d $r21, $a0, 16
+ ld.d $fp, $a0, 24
+ ld.d $s0, $a0, 32
+ ld.d $s1, $a0, 40
+ ld.d $s2, $a0, 48
+ ld.d $s3, $a0, 56
+ ld.d $s4, $a0, 64
+ ld.d $s5, $a0, 72
+ ld.d $s6, $a0, 80
+ ld.d $s7, $a0, 88
+ ld.d $s8, $a0, 96
+ move $a0, $a1
+ jr $ra
+END(longjmp)
diff --git a/usr/klibc/arch/loongarch64/syscall.S b/usr/klibc/arch/loongarch64/syscall.S
new file mode 100644
index 00000000..9a2ed469
--- /dev/null
+++ b/usr/klibc/arch/loongarch64/syscall.S
@@ -0,0 +1,13 @@
+#include <machine/asm.h>
+#include <asm/unistd.h>
+
+ENTRY(__syscall_common)
+ syscall 0
+ li.w $t0, -4096
+ bleu $a0, $t0, 1f
+ sub.d $a0, $zero, $a0
+ la $t0, errno
+ st.d $a0, $t0, 0
+ li.w $a0, -1
+1: jr $ra
+END(__syscall_common)
diff --git a/usr/klibc/arch/riscv64/sysstub.ph b/usr/klibc/arch/loongarch64/sysstub.ph
similarity index 63%
copy from usr/klibc/arch/riscv64/sysstub.ph
copy to usr/klibc/arch/loongarch64/sysstub.ph
index 85c1beb8..699bdc2f 100644
--- a/usr/klibc/arch/riscv64/sysstub.ph
+++ b/usr/klibc/arch/loongarch64/sysstub.ph
@@ -1,12 +1,12 @@
# -*- perl -*-
#
-# arch/riscv/sysstub.ph
+# arch/loongarch64/sysstub.ph
#
# Script to generate system call stubs
#
-# On RISC-V, most system calls follow the standard convention, with the
-# system call number in x17 (a7) and the return value in x10 (a0).
+# On LoongArch64, most system calls follow the standard convention, with
+# the system call number in a7 and the return value in a0.
sub make_sysstub($$$$$@) {
my($outputdir, $fname, $type, $sname, $stype, @args) = @_;
@@ -17,8 +17,8 @@ sub make_sysstub($$$$$@) {
print OUT "#include <asm/unistd.h>\n";
print OUT "\n";
print OUT "ENTRY(${fname})\n";
- print OUT "\tli\ta7, __NR_${sname}\n";
- print OUT "\tj\t__syscall_${stype}\n";
+ print OUT "\tli.w\t\$a7, __NR_${sname}\n";
+ print OUT "\tb\t__syscall_${stype}\n";
print OUT "END(${fname})\n";
close(OUT);
}
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